fdtbus_dma_get
sc->dma_channel = fdtbus_dma_get(phandle,"tx", imx23_dac_dma_intr, sc);
sc->dma_channel = fdtbus_dma_get(phandle,"rx-tx", imx23_mmc_dma_intr,
ch->ch_dma = fdtbus_dma_get(sc->sc_phandle, dmaname, sunxi_codec_dmaintr, ch);
ch->ch_dma = fdtbus_dma_get(sc->sc_phandle, dmaname, sunxi_i2s_dmaintr, ch);
fdtbus_dma_get(int, const char *, void (*)(void *), void *);